Honestly mate, once you know what you're looking at, you should be able to pick something up in every fight. Until then, the only way you'll learn is by doing.
it depends what you are looking for.. if you look for shorter vs taller fighter watch SRL vs Hearns, if you look for some right hand ramming watch Schmelling vs Louis 1 perfect stance,ring iq and footwork i watch rigondaux, he is brutal..